How can FPDI be used to read PDF files in PHP for further manipulation or editing?

To read PDF files in PHP for further manipulation or editing, you can use the FPDI library. FPDI allows you to import existing PDF documents into your PHP application and work with them. By using FPDI, you can extract text, images, and other elements from a PDF file, make modifications, and generate a new PDF output.

require_once('fpdf/fpdf.php');
require_once('fpdi/fpdi.php');

$pdf = new FPDI();
$pageCount = $pdf->setSourceFile('example.pdf');

for ($pageNumber = 1; $pageNumber <= $pageCount; $pageNumber++) {
    $templateId = $pdf->importPage($pageNumber);
    $pdf->addPage();
    $pdf->useTemplate($templateId);
    
    // Add your manipulation or editing code here
}

$pdf->Output('output.pdf', 'F');